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#1
07-30-2009, 10:42 AM
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Noise coming from fan area on 89 300E
I have an 89 300E with about 110K miles. It developed a noise that sounds to me like a bad bearing somewhere in the front of the engine. My guess is either the water pump bearing or fan bearing or some other bearing. Can someone tell what is a common failure and or is there someway to diagnose what's bad before I take it all apart. the plastic fan spins freely when the engine is off.
Thanks Jerry
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91 300SE 150k 90 300SE 103k 89 300E 106K 86 Cimmeron 54K 97 T&C 140K 94 Lesabre 160K 00 LS 155K 71 Corvette 48K 
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#3
07-30-2009, 05:56 PM
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Does your model have a smog pump? If so, those can get pretty noisy when they start to go bad.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#4
07-30-2009, 06:02 PM
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you have to go in and check.. All of the pulleys are susceptible to failure.. Try loosening your belt ( loosen big tensioner bolt 1/2 turn, unscrew tension rod) then wiggle your pulleys one at a time. They should have no slop. Usual culprits are tensioner pulley, idler pulley, a/c, or maybe the fan pulley housing. Its different every time.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2
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#5
07-30-2009, 06:13 PM
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Mechanical Stethoscope...........
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A Dalton
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#7
07-30-2009, 07:57 PM
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Likely the fan bearing bracket... although the air pump idler bearing also seems to have a low expected useful life. Check the fan from the side, the blad should not wobble fore/aft, if it does then you MUST get the bearing bracket looked after SOFORT! Failure of this bearing will almost guarantee the additional cost of a new radiator, belt, and fan (and likely a tow too).
Another rule of thumb... if one of the other idlers goes wobbly, the others will not be too far behind. Once you have the belt off you are best to replace them all... including the AC clutch bearing which you wil need specialized tools to get at (Autozone might have them for loan).
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#8
08-02-2009, 05:45 PM
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Thanks to everyone for the inputs.
I had already tried a stethoscope made out of a piece of garden hose, but it didn't work very well. I'll have to get a better one. I assume I have to take the radiator shroud and radiator out to get at these pulley's.
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91 300SE 150k 90 300SE 103k 89 300E 106K 86 Cimmeron 54K 97 T&C 140K 94 Lesabre 160K 00 LS 155K 71 Corvette 48K
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#9
08-02-2009, 05:49 PM
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That is why I mentioned a mechanics steth.
They have a long metal shaft that you can slip right into each part as it is rotating..they are $5 at most discount places. Garden hose is not applicabe for vibrations........
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A Dalton Last edited by Arthur Dalton; 08-02-2009 at 05:56 PM.
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#10
08-02-2009, 06:04 PM
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I replaced my fan bearing bracket + smog pump idler @ 120k miles and now at 145 k miles the A/C bearing is in need of replacement.
I would say if you hear strange things in there just go ahead and replace them all (fan bearing bracket, smog pump idler, A/C bearing, 2 idlers). They usually fail within a very short interval of each other anyways and the parts really aren't that much (with the exception of the fan bearing bracket). Dedicated idlers you can get @ the Benz dealership, the smog pump and A/C pulleys you can get the bearings pretty inexpensively at www.bearingsdirect.com provided you have the dimensions (which you can easily find on eBay if you know your smog pump and compressor model).
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